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Compact Rooftop
Installation, Operation,
& Maintenance Manual
NR*K120
NR*K180
NR*K240
NR*K299
NR*K360
NR*K480
NR*K541
NR*K660
NR*K840
NR*K09T
NOTICE
Installer:
Please take the time to read and understand the
instructions contained inside this manual prior to
any installation. The installer must give a copy of this
manual to the unit owner.
Owner:
Keep this manual in a safe place in order to provide
service technicians with necessary unit information.
NOT FOR RESIDENTIAL USE
NR Series
Packaged
DOAS Unit
NR*K150
NR*K210
NR*K241
NR*K300
NR*K420
NR*K540
NR*K640
NR*K720
NR*K960
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Table of Contents
Summary of Contents for NEXGEN NR Series
- Page 1 NR Series Packaged Compact Rooftop DOAS Unit Installation, Operation, & Maintenance Manual NR*K120 NR*K150 NR*K180 NR*K210 NR*K240 NR*K241 NR*K299 NR*K300 NR*K360 NR*K420 NR*K480 NR*K540 NR*K541 NR*K640 NR*K660 NR*K720 NR*K840 NR*K960 NR*K09T NOTICE Installer: Please take the time to read and understand the instructions contained inside this manual prior to any installation.
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Page 3: Table Of Contents
NR Series Installation, Operation, and Maintenance Manual Table of Contents: SECTION 1: Safety Introduction and Labeling Guide SECTION 12: Electric Heater Packages Warnings, Dangers, Cautions, and Notices ....5 12.1 Principle of Operation ...........32 Label Placement Guide ............6 12.2 Operating and Safety Controls ........32 12.3 Wiring ...................32... - Page 4 NR Series Installation, Operation, and Maintenance Manual Table of Figures: Figures: Figure 1: Label Placement Drawing ........6 Figure 2: Sample Unit Data Plate ........7 Figure 3: Lifting a Large Unit (S7 Cabinets) ....17 Figure 4: Lifting a Large Unit (S5 Cabinets) ....18 Figure 5: Lifting a Large Unit (S3 Cabinets) ....19...
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Page 5: Section 1: Safety Introduction And Labeling Guide
NR Series Installation, Operation, and Maintenance Manual Section 1: WARNING Safety Introduction and Labeling Guide: Improper installation, service, or maintenance can Your Safety is Important to Us! result in death, injury, or property damage. Read this installation, operation, and maintenance manual Please follow and understand the rules and the thoroughly before installing or servicing this equipment. -
Page 6: Label Placement Guide
NR Series Installation, Operation, and Maintenance Manual Figure 1: Label Placement Drawing Part Number: Description: Location: Brand Logo Serial Data Plate 91070016 CA Prop 65 Label 91060002 R-410A Label 91070002 Fan Warning Label Quality Inspection Stamp 9-21577 Hot Surface Label... -
Page 7: Figure 2: Sample Unit Data Plate
NR Series Installation, Operation, and Maintenance Manual Figure 2: Sample Unit Data Plate NRAK480S5A4A Model # 200303201001 Serial # Tag # MAU-1 Unit Info. Test Pressure Max. Refrigerant Charge R410A Lbs. Volts Phase High Circuit #1 15.91 psig Circuit #2 15.00... -
Page 8: Section 2: Introduction And Pre-Installation
NR Series Installation, Operation, and Maintenance Manual Section 2: WARNING Introduction and Pre-Installation: This unit contains HFC-(R410A), an azeotropic 2.1 - Description of Operation mixture of R-32 (Difluoromethane) and R-125 (Pentafluoroethane). DO NOT VENT HFC-(R410A) to The AK Series unit is a factory-assembled packaged the atmosphere. -
Page 9: Unit Nomenclature Example
NR Series Installation, Operation, and Maintenance Manual 2.3 - Unit Nomenclature Example Digit: Description: Feature: 1 - 2 Product Family NR = Packaged Rooftop A = Dedicated Outdoor Air - Air Cooled R = Recirculating Application E = Dedicated Outdoor Air with ECW... - Page 10 NR Series Installation, Operation, and Maintenance Manual 2.3 - Unit Nomenclature Example, Cont. Digit: Description: Feature: AA = EC 350 BB = EC 450 (Low) 460V Only CC = EC 450 (High) DD = EC 500 (Low) EE = EC 500 (High) 460V Only...
- Page 11 NR Series Installation, Operation, and Maintenance Manual 2.3 - Unit Nomenclature Example, Cont. Digit: Description: Feature: 00 = None B1 = 100MBH C1 = 150MBH D1 = 200MBH E1 = 250MBH F1 = 300MBH G1 = 350MBH 26 - 27...
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Page 12: Section 3: Installer Responsibility
NR Series Installation, Operation, and Maintenance Manual Section 3: WARNING Installer Responsibility: EXPLOSION HAZARD The installer is responsible for the following: Equipment must have access to uncontaminated air at all times. • To install and commission the unit, as well as... -
Page 13: Section 4: Critical Considerations
NR Series Installation, Operation, and Maintenance Manual Section 4: Cabinet: Critical Considerations: 50” 48” 41” 48” 80” 48” 56” 48” 4.1 Required Clearances 104” 48” 56” 60” Clearances are the required distances that the unit must Minimum clearance required for side... -
Page 14: Service Clearances
NR Series Installation, Operation, and Maintenance Manual Table 1: Recommended Torque Settings 4.1.1 Service Clearances Minimum service clearance for service is based on cabinet size described in section 4.1. 4.1.2 Ventilation Clearances Bolt Head Grade Marking In order to help ensure proper operation of an air-source constructed unit, a 48"... -
Page 15: Section 5: National Standards And Applicable Codes
NR Series Installation, Operation, and Maintenance Manual Section 5: 5.6 Electrical National Standards and Electrical connection to unit must be in accordance with the following codes: Applicable Codes: United States: Refer to National Electrical Code®, NFPA 70 5.1 Refrigerant Handling Practices - latest revision. -
Page 16: Section 6: Lifting A Packaged Rooftop Unit
NR Series Installation, Operation, and Maintenance Manual Section 6: WARNING Lifting a Packaged Rooftop Unit: CRUSH HAZARD The unit must be installed in compliance with all Use proper lifting equipment and applicable codes. The qualified installer or service practices. Failure to follow these... -
Page 17: Figure 3: Lifting A Large Unit (S7 Cabinets)
NR Series Installation, Operation, and Maintenance Manual Figure 3: Lifting a Large Unit (S7 Cabinets) SPREADER FIXED FIXED CABLE ADJUST CABLE LENGTH TO LIFT POINTS AS NECESSARY,BASED ON UNIT CENTER OF GRAVITY LIFTING POINTS ON WELDED FRAMES (NUMBER OF LIFTING POINTS MAY VARY) (BOTH SIDES) SEE DETAIL "A"... -
Page 18: Figure 4: Lifting A Large Unit (S5 Cabinets)
NR Series Installation, Operation, and Maintenance Manual Figure 4: Lifting a Medium Unit (S5 Cabinets) ADJUST CABLE LENGTH TO LIFT POINTS AS NECESSARY,BASED ON UNIT CENTER OF GRAVITY FIXED FIXED CABLE SPREADER LIFTING POINTS BOTH SIDES FORMED G90 DETAIL "C"... -
Page 19: Figure 5: Lifting A Large Unit (S3 Cabinets)
NR Series Installation, Operation, and Maintenance Manual Figure 5: Lifting a Small Unit (S3 Cabinets) ADJUST CABLE LENGTH TO LIFT POINTS AS NECESSARY,BASED ON UNIT CENTER OF GRAVITY FIXED FIXED CABLE SPREADER LIFTING POINTS BOTH SIDES FORMED G90 DETAIL "C"... -
Page 20: Section 7: Unit Placement
NR Series Installation, Operation, and Maintenance Manual Section 7: NOTE: Check the installation location to ensure proper clearances to combustibles and clearance for access. Unit Placement: 7.3 Unit Mounting to Roof Curb 7.1 Roof Installation on Curb After the curb has been installed, the unit may be placed Roof curbs are available for units that are to be installed on the curb. -
Page 21: Section 8: Ductwork Consideration
NR Series Installation, Operation, and Maintenance Manual Section 8: 8.1 Inlet Ductwork Ductwork Consideration: Inlet ductwork height and width must be no smaller than the packaged air conditioning unit inlet height and width The unit has been designed to operate at the specific air and supply only uncontaminated air to the unit. -
Page 22: Section 9: Refrigeration Circuits And Piping
NR Series Installation, Operation, and Maintenance Manual Section 9: WARNING Refrigeration Circuits and Piping: EXPLOSION HAZARD 9.1 Refrigerant System contains R-410A refrigerant. Operating pressures This unit utilizes R-410A, a refrigerant with a zero ozone may exceed limits of R-22 service depletion rating, and POE (Copeland) or PVE (Bitzer) equipment. -
Page 23: Figure 7: Circuit Diagram For Standard Compressor
NR Series Installation, Operation, and Maintenance Manual Figure 7: Circuit Diagram for Standard Compressor with Hot Gas Bypass, Modulating Hot Gas Reheat, and Subcooling Page 23 of 80... -
Page 24: Section 10: Energy Recovery/Conservation Wheels
NR Series Installation, Operation, and Maintenance Manual Section 10: DANGER Energy Recovery/Conservation Wheels: ELECTRICAL SHOCK HAZARD 10.1 Principal of Operation Disconnect electric before service. More than one disconnect switch The energy conservation wheel module is a self-contained may be required to disconnect unit consisting of the following components: electric from equipment. -
Page 25: Cleaning The Wheel
NR Series Installation, Operation, and Maintenance Manual Figure 16: Example Energy Recovery (ECW) Wheel Construction 10.3 Cleaning The Wheel In the event that routine annual inspection (or pressure drop greater than 10% of factory rating is observed indicates that there is dirt or dust buildup within the... -
Page 26: Section 11: Gas Heater Packages
NR Series Installation, Operation, and Maintenance Manual Section 11: DANGER Gas Heater Packages: ELECTRICAL SHOCK HAZARD 11.1 Principle of Operation Disconnect electric before service. More than one disconnect switch The gas furnace is an 80% efficient, self-contained duct may be required to disconnect furnace that can burn natural gas or LPG. -
Page 27: Operating And Safety Controls
NR Series Installation, Operation, and Maintenance Manual 11.4 Wiring 11.3 Operating and Safety Controls All electric wiring and connections, including electrical Safety systems are required for proper performance of grounding, must comply with; the gas furnace. The gas furnace shall not be permitted to operate with any safety system disabled. - Page 28 NR Series Installation, Operation, and Maintenance Manual 10.5.2 Sequence of Operation for 20-100% immediately and the combustion blower following a 30 second post-purge period. If the thermostat Modulating Furnace with 250-400 MBH (73.3- (controller) is still calling for heat one hour after a 117.2 kW) Input...
- Page 29 NR Series Installation, Operation, and Maintenance Manual 10. If the controller is providing an analog signal between 0.5 and 5.3VDC to the SC30 control, the system will continue to run at low speed combustion blower and with only the 1st stage valve open. The modulating...
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Page 30: Figure 8: Example Gas Heater Wiring Diagram - 10.1 Modulation
NR Series Installation, Operation, and Maintenance Manual Figure 8: Example Gas Heater Wiring Diagram - 10:1 Modulation GAS FURNACE POWER SUPPLY FOR 208 VOLT UNITS (BUCKBOOST TRANSFORMER) BL‐14 BL‐14 SPLICE SPLICE SPLICE SPLICE BK‐14 BK‐14 3 Amps Fuses, SPLICE Y‐14 Class CC, GAS FURNACE #1 LINE 600volts, 100 VA VOLTAGE TERMINALS BK‐14 Time Delay (SEE FURNACE WIRING DIAGRAM) G‐14 Modulating Furnace Control Panel 230 VOLT, 1‐PHASE, 60‐HERTZ POWER SUPPLY WIRE TO ... -
Page 31: Figure 9: Example Gas Heater Wiring Diagram - Dual Furnace
NR Series Installation, Operation, and Maintenance Manual Figure 9: Example Gas Heater Wiring Diagram - Dual Furnace GAS FURNACE POWER SUPPLY FOR 460 VOLT UNITS Class CC, 4 amps fuse 600volts, Time Delay BL-14 BL-14 460V 1000 R-14 120V BK-14... -
Page 32: Section 12: Electric Heater Packages
NR Series Installation, Operation, and Maintenance Manual Section 12: DANGER Electric Heater Packages: ELECTRICAL SHOCK HAZARD 12.1 Principle of Operation Disconnect electric before service. More than one disconnect switch The electric heater is a self-contained duct heater may be required to disconnect comprised of: electric from equipment. -
Page 33: Table 3: Standard Electric Heaters
NR Series Installation, Operation, and Maintenance Manual Table 3: Standard Electric Heaters Minimum Maximum Minimum Maximum Model Function 3850 3850 3850 1500 6600 1500 6600 1500 6600 1500 6600 1500 6600 2000 8800 2000 8800 2666 11733 2666 11733 3333... -
Page 34: Figure 10: Example Electrical Heater Wiring Diagram
NR Series Installation, Operation, and Maintenance Manual Figure 10: Typical Electric Heater Wiring Diagram Elec. Heat Enable See separate SCR or up to 4 Stage Elec. Heater Drawing Enable 1 Stage or SCR Heating Enable 2 Stage Heating Enable 3... -
Page 35: Section 13: Unit Electrical
NR Series Installation, Operation, and Maintenance Manual Section 13: DANGER Unit Electrical: ELECTRICAL SHOCK HAZARD Each unit is equipped with a wiring diagram (permanently Disconnect electric before service. attached behind clear view plastic on the inside of the More than one disconnect switch... -
Page 36: Figure 11: Example Electrical Wiring Diagram
NR Series Installation, Operation, and Maintenance Manual Figure 11a: Typical Electrical Wiring Diagram MSP‐CC1 R‐10 R‐10 R‐10 BL‐10 BL‐10 BL‐10 BK‐10 BK‐10 BK‐10 CCH1 G‐14 R‐14 CC1‐A1 BK‐14 CURRENT SENSOR OUTDOOR FAN MOTOR VFD (OF1VFD)CONTROL TERMINAL STRIP CC1‐A1 OF1VFD CC2‐A1 MSP‐CC2 R‐10 R‐10 R‐10 BL‐10 BL‐10 BL‐10... - Page 37 NR Series Installation, Operation, and Maintenance Manual Figure 11b: Typical Electrical Wiring Diagram Line NOTE: SEE “T1” ON SHEET 1 96 VA NOTE: SEE “T3” ON SHEET 1 FOR WIRING CONTINUATION Voltage CLASS 2 FOR WIRING CONTINUATION 50/60HZ PM AUX 50/60HZ R‐14 R‐14 G‐14 G‐14 R‐14 BL‐14 R‐14 Remove jumper when field installed safeties are used UNLOADER SOLENOID #1 Enable Unloader #1 HPR1 1,2,3,4, Enable Compressor #1 HPR2 11,12,13, Enable Compressor #2...
- Page 38 NR Series Installation, Operation, and Maintenance Manual Figure 11c: Typical Electrical Wiring Diagram CONTINUED ON SHEET 2 BOS1 Enable Switchable Subcooling 138, 140 LSS1A N.O. N.C. LSS2A LSS1B N.O. N.C. LSS2B Enable Supply Fan SF1R Enable Hot Gas Reheat 134, 210 Elec. Heat Enable See separate 2‐Stage Elec. Heater Drawing Enable 1 Stage Heating Enable 2 Stage Heating OADA OADA Enable Outdoor Air Damper Actuator 24VAC WIRING DIAGRAM #PrelimWD | PROA180B2A3DEBDBB2B | 230‐3‐60 | SHEET 3 OF 7 | 12/10/19 DWN CHK ...
- Page 39 NR Series Installation, Operation, and Maintenance Manual Figure 11d: Typical Electrical Wiring Diagram REHEAT CONTROL VALVE (MUELLER VALVE) IF Mueller Valve is used wire as below REHEAT VALVE CAP PINK WIRE SEPARATELY UO‐4 0‐10VDC Output See ALC PAGE WIRE ALL SHIELD WIRES TO CLOSEST “GND” TERMINAL AT THE CONTROL PANEL PDB1 ELECTRIC HEATER LINE VOLTAGE TERMINALS (FUSED INTERNALY) USE USE ELECTRIC HEATER VENDORS RECOMMENDED WIRE SIZE WIRING DIAGRAM #PrelimWD | PROA180B2A3DEBDBB2B | 230‐3‐60 | SHEET 4 OF 7 | 12/10/19 DWN CHK Page 39 of 80...
- Page 40 NR Series Installation, Operation, and Maintenance Manual Figure 11e: Typical Electrical Wiring Diagram FIELD INSTALL EQUIPMENT TOUCH SEE TB4 ON UNIT LonWorks Card (optional) WIRING DIAGRAM Green Black Temp/RH White ZS Room To Wall Mount the Sensor Equipment Touch remove Port 2b ‐ the factory installed cable Power and wire +24VAC to TB4 “K3” 24VAC External and wire Gnd to TB4 “K4”. If 3V Litium Battery Battery CR‐123A there is a ZS sensor installed + 3V wire Rnet+ and Rnet‐ to the...
- Page 41 NR Series Installation, Operation, and Maintenance Manual Figure 11f: Typical Electrical Wiring Diagram SEE TB4 ON UNIT WIRING DIAGRAM 24VAC Gnd 16 Universal UI‐16 Inputs 9‐16 + 15 0‐5V Gnd 14 Therm/ Power UI‐15 + 13 Gnd 12 UI‐14 + 11 0‐5V Gnd 10 UI‐13 + 9 Therm/Dry Gnd 8 UI‐12 + 7 Gnd 6 UI‐11 + 5...
- Page 42 NR Series Installation, Operation, and Maintenance Manual Figure 11g: Typical Electrical Wiring Diagram LEGEND ‐ ITEMS INSIDE CONTROL PANEL LEGEND ‐ ITEMS OUTSIDE CONTROL PANEL FUNCTIONAL FUNCTIONAL ITEM LINE NUMBER DESCRIPTION ITEM LINE NUMBER DESCRIPTION DESIGNATION DESIGNATION Supply Fan Motor Contactor Air Pressure Switch (Supply Fan) Supply Fan Motor Relay 265, 266 Air Pressure Switch (Supply Fan and Exhaust Fan) MSP‐SF Motor Starter Protection‐Supply Fan BCTL BCTL SF‐VFD Supply Fan‐Variable Frequency Drive BOS1 Bleed‐Off Solenoid no. 1 Compressor Contactor no. 1 BOS1, BOS2 132, 134...
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Page 43: Operation
Purpose General Operational Specifications The purpose of the DPM Line Voltages Monitored: 200 to 240VAC, 1Ø, 50/60Hz NR Series Installation, Operation, and Maintenance Manual (Digital Phase Monitor) is to 200 to 600VAC, 3Ø, 50/60Hz monitor the line voltage sup- Faults:... -
Page 44: Figure 12: Phase Monitor Data
NR Series Installation, Operation, and Maintenance Manual Figure 12b: Phase Monitor Data Example: If you want to change the Re-Start Delay to 3 minutes (default is 2 minutes) and you are on the Default screen: 1. Press the Right arrow until you get to the Re-Start Delay screen 2. -
Page 45: Section 14: Sequence Of Operation
NR Series Installation, Operation, and Maintenance Manual Section 14: DANGER Sequence of Operation: ELECTRICAL SHOCK HAZARD 14.1 Unit Configuration Disconnect electric before service. More than one disconnect switch Based on the unit's application, the unit may be may be required to disconnect configured in any number styles to achieve the described electric from equipment. -
Page 46: Basic Sequence Of Operation
NR Series Installation, Operation, and Maintenance Manual 14.3 Basic Sequence of Operation All sequence of operation information for units controlled with ALC controls is available in the ALC Sequence of Operation documents that can be downloaded from the NexGen website at www.nexgendoas.com. -
Page 47: Section 15: Start-Up Procedure
NexGen Equipment must always be and conform to all requirements set forth in the NexGen properly grounded. manuals and all applicable governmental authorities pertaining to the installation, service operation and SEVERE INJURY HAZARD labeling of the equipment. -
Page 48: Figure 14: P-Trap Configuration
NR Series Installation, Operation, and Maintenance Manual Figure 14: P-Trap Configuration CAUTION! Drain Pan Condensate traps must be installed based on the guidelines below. Units must also be level, or slightly inclined towards the drain. Failure to follow these guidelines could cause condensate not to drain properly, and potential intrusion of water into the space. -
Page 49: Table 6: Hot Water Heating Coil Flow Rate
NR Series Installation, Operation, and Maintenance Manual Table 6: Hot Water Heating Coil Flow Rate and Pressure Drop Nominal GPM Pressure Drop Model Cabinet (Water Only) (FT, H2O) 120 - 299 24.6 1.23 241 - 540 44.2 2.09 541 - 09T 89.2... -
Page 50: Table 10: Refrigerant Temperature-Pressure
NR Series Installation, Operation, and Maintenance Manual Table 10: Refrigerant Temperature-Pressure Chart (PSIG) Temp Temp Temp Temp R-22 R-134A R-410A R-22 R-134A R-410A °F °C °F °C 14.8(“Hg) 10.8 60.0 101.6 57.4 170.7 16.0 13.9(“Hg) 12.1 62.0 105.4 60.0 176.6 17.0... -
Page 51: Pre-Start Checklist
EXPLOSION HAZARD service of equipment sold and supplied by NexGen and System contains R-410A conform to all requirements set forth in the NexGen manuals refrigerant. Operating pressures and all applicable governmental authorities pertaining to the may exceed limits of R-22 service installation, service, operation and labeling of the equipment. - Page 52 NR Series Unit Pre-Start Form PRE-START CHECKLIST ☐ ☐ Documentation to properly start the unit including Electrical connections are tight. the sequence of operation, and a copy of the work ☐ order listing complete unit configuration. Overloads are adjusted. ☐...
- Page 53 NR Series Installation, Operation, and Maintenance Manual Notes: Page 53 of 80...
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Page 54: Explosion Hazard
Do not operate with service of equipment sold and supplied by NexGen and access doors open. Installation, conform to all requirements set forth in the NexGen manuals operation, and maintenance and all applicable governmental authorities pertaining to the must be performed by a trained installation, service, operation and labeling of the equipment. -
Page 55: Start-Up Form
R-22 service service of equipment sold and supplied by NexGen and equipment. Use proper refrigerant conform to all requirements set forth in the NexGen manuals handling practices, tools, and and all applicable governmental authorities pertaining to the equipment. -
Page 56: General Information
NR Series Unit Start-Up Form GENERAL INFORMATION Project Name: Customer Name: Contractor Name: Address: Unit Model #: City/State/Zip: Unit Serial #: Phone/Fax: Unit Tag #: APPLICATION INFORMATION Outdoor Air Supply Air Temp (°F or °C): Temp (°F or °C): Return Air Outdoor Fan Temp (°F or °C):... -
Page 57: Unit Information
NR Series Unit Start-Up Form UNIT INFORMATION Condenser Fan Motor: Make: Model: Voltage: AMPS: Quantity: Energy Conservation Wheel Motor: Make: Model: Voltage: AMPS: Unit Compressors: Manufacturer: C1A - Model Number: Serial Number: Nameplate: Voltage: C1B -Model Number: Serial Number: Phase:... -
Page 58: Start-Up Check
NR Series Unit Start-Up Form START-UP CHECK Supply Fan: (AMPS) (AMPS) (AMPS) (inWG) Command % or RPM Exhaust Fan: (AMPS) (AMPS) (AMPS) (inWG) Notes: Command % or RPM 1. Taken from field supply ductwork. 2. Taken from field Energy Recovery Wheel: return ductwork. - Page 59 NR Series Unit Start-Up Form COOLING CHECK Compressor Circuit #2: Suction Pressure: Suction Temp: Saturation Temp: Discharge Pressure: Discharge Temp: Saturation Temp: Liquid Pressure: Liquid Temp: To Calculate Superheat: Convert suction pressure to saturation temperature, Superheat: then subtract the suction line temperature.
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Page 60: Energy Conservation
NR Series Unit Start-Up Form COOLING CHECK Hot Gas Bypass/Hot Gas Reheat: Hot Gas Bypass: Valve Begins to Open at 105PSI - Fully Open at 100PSI Staged: Modulating: SAT °F: Hot Gas Reheat: Additional Charge: Additional Charge: Added or Subtracted - Circuit 1:... - Page 61 NR Series Unit Start-Up Form Comments: Owner’s Representative: Signature: Page 7 of 7...
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Page 62: Section 17: Unit Maintenance
NexGen must be performed by a trained and conform to all requirements set forth in the NexGen technician only. manuals and all applicable governmental authorities Failure to follow these instructions can result in pertaining to the installation, service, operation and death, electrical shock, or injury. -
Page 63: General
NR Series Installation, Operation, and Maintenance Manual Table 11: Maintenance Guidelines 17.1 General Follow the entire start-up procedure at this time and check settings (controls, operating Quarterly temperatures, operating pressures, power and control voltages) and operation. 17.2 Unit Exterior After installation, touch up scratches. Periodic painting should be done thereafter Cabinet Exterior as required. -
Page 64: Section 18: Replacement Parts
NR Series Installation, Operation, and Maintenance Manual Section 18: DANGER Replacement Parts: ELECTRICAL SHOCK HAZARD Before ordering replacement parts from any other Disconnect electric before service. source, please contact the factory to obtain the correct More than one disconnect switch replacement part information for your specific unit. -
Page 65: Table 12: Air Filters
NR Series Installation, Operation, and Maintenance Manual Table 12: Air Filters Cabinet Size Filter Size* Quantity 20 x 20 120 - 299 16 x 20 241 - 540 25 x 25 20 x 20 541 - 09T 20 x 24... -
Page 66: Section 19: Troubleshooting
Equipment must always be and service of equipment sold and supplied by NexGen properly grounded. and conform to all requirements set forth in the NexGen SEVERE INJURY HAZARD manuals and all applicable governmental authorities Do not enter equipment while in pertaining to the installation, service, operation and operation. -
Page 67: Supply Fan
NR Series Installation, Operation, and Maintenance Manual Table 13.1: Supply Fan Problem Probable Cause Solution Damper limit switch not closed Repair or replace switch or inoperative Motor thermal overloads tripped For tripped condition-reset Blower Motor Does Not Run Fuses blown or missing... -
Page 68: Compressor
NR Series Installation, Operation, and Maintenance Manual Table 13.2: Compressor Problem Probable Cause Solution Power off, loose electrical connections or Check disconnect switch, fuses and wiring fuse open Check voltage to contactor coil, transformer Compressor contactor not closing slave relay, thermostat If compressor is hot, allow 2 hours to cool –... - Page 69 NR Series Installation, Operation, and Maintenance Manual Table 13.2: Compressor, Cont. Problem Probable Cause Solution Check incoming voltage leg-to-leg All three legs must be within 10% of the Low voltage required voltage and the leg-to-three-leg average voltage variation must be less than...
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Page 70: Refrigeration Circuit
NR Series Installation, Operation, and Maintenance Manual Table 13.3: Refrigeration Circuit Problem Probable Cause Solution Air noise Check ductwork Air Velocity too high Check for adequate control voltage, check Chattering contactor for shorts or breaks, check thermostat, Noisy Operation check contactor points... - Page 71 NR Series Installation, Operation, and Maintenance Manual Table 13.3: Refrigeration Circuit, Cont. Problem Probable Cause Solution Check thermostat, check heat Thermostat location or malfunction anticipator setting Improper refrigerant charge Check subcooling, verify superheat Defective high or low pressure control Check high or low pressure switch...
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Page 72: Variable Speed Head Pressure Control
NR Series Installation, Operation, and Maintenance Manual Table 13.4: Variable Speed Head Pressure Control Problem Probable Cause Solution No 24V control voltage Check for 24 VAC at control Check alignment of capillary fitting Schrader valve depressor must depress No input pressure to control... - Page 73 NR Series Installation, Operation, and Maintenance Manual Table 13.4: Variable Speed Head Pressure Control, Cont. Problem Probable Cause Solution Regulator seat is restricted Locate and remove stoppage, install strainer Pressure adjusting stem is set at a point so high that suction pressure never reaches...
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Page 74: Gas Furnace
NR Series Installation, Operation, and Maintenance Manual Table 13.5: Gas Furnace LED flashes on for 1/4 second and off for 1/4 second during fault condition. Pause between fault codes is 3 seconds. Problem Probable Cause Solution Steady On-No Internal control fault... -
Page 75: Electric Heater
NR Series Installation, Operation, and Maintenance Manual Table 13.6: Electric Heater Problem Probable Cause Solution Check that the controls are set to call No call for heat for heating Check that heater has power and No Heat No power and control voltage to heater... -
Page 76: Section 20: Warranty
No warranty coverage is applicable if Buyer cannot prove original The following is the Limited Warranty provided by NexGen purchase date and required annual maintenance (a trade name of Addison HVAC LLC, herein “Seller”) to history, the data plate and/or serial number on any any customer (herein “Buyer”) for any goods and services... - Page 77 NR Series Installation, Operation, and Maintenance Manual Except as set forth in these terms, Seller makes no representation or warranty of any type, express or implied, including any warranty of merchantability, warranty of fitness for a particular purpose or warranty of non-infringement or warranty arising from any course of dealing, course of performance or usage of trade.
- Page 78 NR Series Installation, Operation, and Maintenance Manual Notes: Page 78 of 80...
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Page 79: Revision Guide
NR Series Installation, Operation, and Maintenance Manual Revision Guide: Date: Page: Description: 27 Jun 22 First Published Page 79 of 80... - Page 80 7050 Overland Road Orlando, FL 32810 Tel.: 407-292-4400 ∙ Fax: 407-290-1329 www.nexgendoas.com Part Number: AD-IOM-NRAK-001 Rev.: 27 June 2022DS *AD-IOM-PRAK-001* © Addison 2022...
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